Tamira Paszek saw off the challenge of French star Marion Bartoli with a fiercely-fought three set thriller over 185 gruelling minutes.
The 21-year-old Austrian ace saw off the defending champion 4-6 7-5 6-4 in blustery conditions on Centre Court.
Paszek, the world #59, admitted: “I had to try to keep moving and keep focused because it was very, very tough conditions out there.
“It was very, very tough, I just had to try to keep moving, keep my focus. I was actually pretty calm. But I felt my hands were freezing cold all through the match.
“I wasn’t frustrated with the way it is, the weather was that way. You cannot change Mother Nature, so for that reason I just tried to keep focus on every point.
“It feels amazing to be in the final, and I love Eastbourne – it feels like home coming back every year.”
Paszek will play in her first WTA final this term, and in her maiden Eastbourne title decider.
She faces rising German star Angelique Kerber who thrashed Czech Republic’s Klara Zakapolova 6-0 6-3 in an hour.
Beaten Bartoli, who needed her thigh strapped when trailed 3-2 in the final set, fumed: “It was a nightmare to play in those conditions! I got chances in every single game and ended up losing them.
“My leg got pretty tight and then tired, but I think in two or three days it will be back to normal.
“In these conditions, even if I was leading, I never felt comfortable. I didn’t make one ace today, where yesterday I served 10 or 12. It’s really levelling when you have those kind of conditions.
“But I really tried my hardest, and there is not much I could have done better or try harder. On the other hand Tamira played really well, she deserved to win.”